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Server tun worker now in redial goroutine. TODO: Finish full two-way state change msging
This commit is contained in:
Russ Magee
parent
1a153b31ee
commit
dd37922fb2
1 changed files with 71 additions and 75 deletions
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@ -140,86 +140,82 @@ func (hc *Conn) StartClientTunnel(lport, rport uint16) {
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func (hc *Conn) StartServerTunnel(lport, rport uint16) {
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hc.InitTunEndpoint(lport, "", rport)
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t := hc.tuns[rport] // for convenience
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var err error
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//go func() {
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// for cmd := range t.Ctl {
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// var c net.Conn
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// if cmd == 'a' {
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logger.LogDebug("Server dialling...")
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c, err := net.Dial("tcp", fmt.Sprintf(":%d", rport))
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if err != nil {
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logger.LogDebug(fmt.Sprintf("Nothing is serving at rport :%d!", rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, /*lport*/uint16(0))
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binary.Write(&resp, binary.BigEndian, rport)
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hc.WritePacket(resp.Bytes(), CSOTunRefused)
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} else {
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logger.LogDebug(fmt.Sprintf("[Tunnel Opened - %d:%s:%d]", lport, t.Peer, rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, lport)
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binary.Write(&resp, binary.BigEndian, rport)
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logger.LogDebug(fmt.Sprintf("[Writing CSOTunSetupAck[%d:%d]", lport, rport))
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hc.WritePacket(resp.Bytes(), CSOTunSetupAck)
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//
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// worker to read data from the rport (to encrypt & send to client)
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//
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go func() {
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defer func() {
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c.Close()
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}()
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var tunDst bytes.Buffer
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binary.Write(&tunDst, binary.BigEndian, t.Lport)
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binary.Write(&tunDst, binary.BigEndian, t.Rport)
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for {
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rBuf := make([]byte, 1024)
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// Read data from c, encrypt/write via hc to client(lport)
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n, e := c.Read(rBuf)
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if e != nil {
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if e == io.EOF {
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logger.LogDebug(fmt.Sprintf("rport Disconnected: shutting down tunnel %v\n", t))
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} else {
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logger.LogDebug(fmt.Sprintf("Read error from rport of tun %v\n%s", t, e))
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}
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go func() {
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for cmd := range t.Ctl {
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var c net.Conn
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if cmd == 'a' {
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logger.LogDebug("Server dialling...")
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c, err = net.Dial("tcp", fmt.Sprintf(":%d", rport))
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if err != nil {
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logger.LogDebug(fmt.Sprintf("Nothing is serving at rport :%d!", rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian /*lport*/, uint16(0))
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binary.Write(&resp, binary.BigEndian, rport)
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hc.WritePacket(resp.Bytes(), CSOTunRefused)
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} else {
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logger.LogDebug(fmt.Sprintf("[Tunnel Opened - %d:%s:%d]", lport, t.Peer, rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, lport)
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binary.Write(&resp, binary.BigEndian, rport)
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hc.WritePacket(resp.Bytes(), CSOTunDisconn)
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logger.LogDebug(fmt.Sprintf("Closing server rport %d net.Dial()", t.Rport))
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break
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}
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if n > 0 {
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rBuf = append(tunDst.Bytes(), rBuf[:n]...)
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hc.WritePacket(rBuf[:n+4], CSOTunData)
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}
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}
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}()
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logger.LogDebug(fmt.Sprintf("[Writing CSOTunSetupAck[%d:%d]", lport, rport))
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hc.WritePacket(resp.Bytes(), CSOTunSetupAck)
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// worker to read data from client (already decrypted) & fwd to rport
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go func() {
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defer func() {
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c.Close()
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}()
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//
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// worker to read data from the rport (to encrypt & send to client)
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//
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go func() {
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defer func() {
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c.Close()
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}()
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for {
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rData, ok := <-t.Data
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if ok {
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c.Write(rData)
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} else {
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logger.LogDebug("[ERROR reading from hc.tuns[] channel - closed?]")
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break
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var tunDst bytes.Buffer
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binary.Write(&tunDst, binary.BigEndian, t.Lport)
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binary.Write(&tunDst, binary.BigEndian, t.Rport)
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for {
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rBuf := make([]byte, 1024)
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// Read data from c, encrypt/write via hc to client(lport)
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n, e := c.Read(rBuf)
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if e != nil {
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if e == io.EOF {
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logger.LogDebug(fmt.Sprintf("rport Disconnected: shutting down tunnel %v\n", t))
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} else {
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logger.LogDebug(fmt.Sprintf("Read error from rport of tun %v\n%s", t, e))
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}
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, lport)
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binary.Write(&resp, binary.BigEndian, rport)
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hc.WritePacket(resp.Bytes(), CSOTunDisconn)
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logger.LogDebug(fmt.Sprintf("Closing server rport %d net.Dial()", t.Rport))
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break
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}
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if n > 0 {
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rBuf = append(tunDst.Bytes(), rBuf[:n]...)
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hc.WritePacket(rBuf[:n+4], CSOTunData)
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}
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}
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}()
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// worker to read data from client (already decrypted) & fwd to rport
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go func() {
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defer func() {
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c.Close()
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}()
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for {
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rData, ok := <-t.Data
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if ok {
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c.Write(rData)
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} else {
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logger.LogDebug("[ERROR reading from hc.tuns[] channel - closed?]")
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break
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}
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}
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}()
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}
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}
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}()
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}
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// } else if cmd == 'h' {
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// logger.LogDebug("[Server hanging up on rport on behalf of client]")
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// c.Close()
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// } else {
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// logger.LogDebug("[ERR: this should be unreachable]")
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// }
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// } // t.Ctl read loop
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// logger.LogDebug("[ServerTunnel() exiting t.Ctl read loop - channel closed??]")
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//}()
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} // TODO: elseifs for other state transtions driven by client
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}
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}() // t.Ctl read loop
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logger.LogDebug("[ServerTunnel() exiting t.Ctl read loop - channel closed??]")
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}
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